JVC DR-E22BK Service Manual page 40

DR-E22BK
DR-E22LBK
Reparing of Audio PC Board
There are two types of small, modular printed circuit boards mounted vertically on the audio amp board (ENJ-012).
1) Equalizer Board (ENJ-004)
2) ANRS Board (ENJ-01 1)
(1) Before replacing parts on one of the modular boards, check all the pins.
1. Equalizer Board (ENJ-004) 2. ANRS Board (ENJ-011).
Nature of the
problem
No recording possi- | fs there power? @@) (P801)
ts the recording bias supplied? ©® (P801)
Is the recording signa! @®«s {P8017}
reaching the equalizer board?
The playback/ Is the playback F — Playback
recording F Characteristic normal? module
Nature of the
problem
Check Pcint |
Check Point Check
No recording possi-
ble in any mode
Is there power?
ble in any mode
Is the playback signal arriving?
P901
©O@®
is the A/B signal select P901 G0 ay
normal?
Is the REC select normal? P901(4)
P902 (3)
Is ther output?
Is the replay signal arriving? P901
©O@®
ts the MS select normal? P901 ©)
root ©
arriving?
7302 ©
p02 O©
peo @)
ALC does not work | Is the ALC inhibit control P902 @)
normal?
Monitoring impossi- | Is the replay signal arriving? P901 ®@)
ble-during Is the REC control normal? P901 (4)
duplication
Is there output? G)
apa are Tis the recording equalizer input MAD@®
good: normal? (P701)
Paybock impos DO_wro0
Is there a cut head wire? O@8 a4
{P701)
ts there output? ®OOE 4d
(P701)
The playback F Is the playback equalizer @a) @
characteristic is no | switch input normal? (P701}
good
The head can not be
extended
Recording
impossible
[foment
High speed metal FQ
switch
extend select
Q905,907,
Low speed EQ Switch ALC 28C1740IR,S)
Low. speed metal EQ
switch
ALC inhibit
REC/PB NR
2SC1740(R,S)
AN7363N
Signal amp B/A
% 1C701/702 1€701/702 }|M51522L
mechanism
B mechanism metal FQ
switch
Q702 2SK301(P,Q)
A mechanism metal EQ
switch G752
A mechanism double
speed EQ switch Q754